// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()

  const db=cloud.database()

  try{
    return await db.collection("event").where({
      _id:event.id
    }).update({
      data:{
        participants:event.participants
      }
    })
  }
  catch(err){
    return err
  }

  return {
    event,
    openid: wxContext.OPENID,
    appid: wxContext.APPID,
    unionid: wxContext.UNIONID,
  }
}